Multifan Acoustic Doppler System for Velocity Measurement
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Solution Overview
Problem
Existing sonar systems face challenges in accurately determining Doppler velocities due to multiple sources of error, which limits their utility in survey and navigation tasks.
Innovation Solution
A multifan survey system and method that uses an array of projectors to transmit fan-shaped beams and an array of hydrophones to receive echoes, processing these echoes to provide Doppler radial velocity estimates and ultimately calculate relative velocities.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If conventional sonar systems are used to determine Doppler velocities, then the basic functionality of velocity measurement is achieved, but multiple sources of error reduce measurement accuracy
Solution Approach 1:
The sonar system divides the measurement process into multiple independent fan beams (i>=2 fans) with multiple hydrophone beams (j>=2 beams per fan) to measure Doppler velocities. By segmenting the measurement into multiple independent observations (i*j beams total), the system can average results to reduce random errors and improve measurement precision while maintaining reliability through redundant measurements from different angular perspectives.
2Measurement precision
If multiple fan beams and hydrophone beams are used to improve velocity measurement accuracy, then measurement precision improves, but system complexity increases
Solution Approach 1:
The projector array and hydrophone array are designed to perform multiple functions: they can steer multiple fan beams in different directions, process multiple hydrophone beams simultaneously, and extract Doppler velocity information from each beam. This multi-functionality allows the same hardware infrastructure to support complex multi-beam measurements without proportionally increasing system complexity, as the arrays can be configured to achieve various measurement geometries.
Applied Scientific Principles
This section explains which scientific principles are used to turn an abstract innovation direction into a practical engineering solution.
Function Achieved in This Case
The multifan survey system enhances the accuracy of Doppler velocity measurements, improving the effectiveness of survey tasks such as bathymetry, water column monitoring, and motion stabilization.
Implementation Method 1
an array of projectors transmits a beam that ensonifies reflectors
Implementation Method 2
an array of hydrophones receives echoes from these reflectors
Implementation Method 3
the Doppler system utilizes a transmitter message for ensonifying i>=2 fans... hydrophone returns processed to calculate for each of (i*j) beams respective Doppler radial velocity estimates
Data Source
AI summary
A survey system including a multibeam echo sounder having a projector array and a hydrophone array uses a multi-component message to ensonify one or more fans to estimate a Doppler velocity.